<template>
<div id="home" class="wrapper">
  <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
  <tab-control :titles="['流行','新款','精选']"
               @tabClick="tabClick"
               ref="tabControl1"
               class="tab-control" v-show="isTabFixed"/>
    <scroll class="content"
            ref="scroll"
            :probe-type="3"
              @scroll="contentScroll"
            :pull-up-load="true"
            @pullingUp="LoadMore">
      <home-Swiper :banners="banners" @swiperImageLoad="swiperImageLoad"/>
      <recommend-view :recommends="recommends"/>
      <feature-view/>
      <tab-control :titles="['流行','新款','精选']"
                   @tabClick="tabClick"
                   ref="tabControl2"/>
      <goods-list :goods="showGoods"/>
    </scroll>

<!--  <div>哈哈哈哈</div>-->
   <!--在我们需要监听一个组件的原生事件时,必须给对应的事件加尚.native修饰符,才能进行监听-->
    <back-top @click.native="backClick" v-show="isShowBackTop" />

</div>
</template>

<script>
  import HomeSwiper from "./childComps/HomeSwiper"
  import RecommendView from "./childComps/RecommendView";
  import FeatureView from "./childComps/FeatureView";

  import NavBar from "components/common/navbar/NavBar";
  import TabControl from "components/content/tabCrotrol/TabControl";
  import GoodsList from "components/content/goods/GoodsList";
  import scroll from "components/common/scroll/Scroll";
  // import BackTop from "components/content/backTop/BackTop";


  import {getHomeMultidata, getHomeGoods} from "network/home";
  import {itemListenerMixin,backTopMixin} from "common/mixin"

  export default {
    name: "Home",
    components: {
      HomeSwiper,
      RecommendView,
      FeatureView,
      NavBar,
      TabControl,
      GoodsList,
      scroll,
      // BackTop
    },
    mixins: [itemListenerMixin,backTopMixin],
    data() {
      return {
        banners: [],
        recommends: [],
        goods: {
          'pop': {page:0, list: [] },
          'new': {page: 0, list: [] },
          'sell': {page: 0, list: [] }
        },
        currentType: 'pop',
        // isShowBackTop: false,
        tabOffsetTop: 0,
        isTabFixed: false,
        saveY:0,
      }
    },
    computed: {
      showGoods() {
        return this.goods[this.currentType].list
      }
    },
    destroyed() {
      console.log('home destroyed')
    },
    activated() {
      this.$refs.scroll.scrollTo(0, this.saveY, 0)
      this.$refs.scroll.refresh()
    },
    deactivated() {
      //1保存Y值
      this.saveY = this.$refs.scroll.getScrollY()

      //2.取消全局事件的监听
      this.$bus.$off('itemImgLoad' , this.itemImgListener)
    },
    //生命周期函数
    created() {
      //1.请求多个数据
      this.getHomeMultidata()

      //2.请求商品数据
      this.getHomeGoods('pop')
      this.getHomeGoods('new')
      this.getHomeGoods('sell')
    },

    mounted() {

    },
    methods: {
      /*
      * 事件监听相关的事件
      * */
      tabClick(index){
        switch (index) {
          case 0:
            this.currentType = 'pop'
            break
          case 1:
            this.currentType= 'new'
            break
          case 2:
            this.currentType= 'sell'
            break
        }
        //让首页两个TabControl的currentIndex保持一致 (bug)
        this.$refs.tabControl1.currentIndex = index ;
        this.$refs.tabControl2.currentIndex = index ;

      },
      // backClick() {
      //   //this.$refs.scroll.scroll.scrollTo(0,0)
      //   this.$refs.scroll.scrollTo(0, 0,300);
      //   //this.$refs.scroll.scroll.scrollTo(0,0),{ probeType: 2, click: true,  mouseWheel: true, observeDOM: true }
      //   //console.log('btnClick')
      //
      // },
      contentScroll(position){
        //1. 判断BackTop按钮是否显示
        this.isShowBackTop = (-position.y) > 1000

        //2.决定tabControl是否吸顶(pisition:fixed)
        this.isTabFixed = (-position.y) > this.tabOffsetTop
      },

      LoadMore(){
        this.getHomeGoods(this.currentType)
        // //Bug 解决
        // this.$refs.scroll.scroll.refresh()

      },
      swiperImageLoad(){
        this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
      },
      /*
        网络请求相关的方法
      */
      getHomeMultidata(){
        //1.请求多个数据
        getHomeMultidata().then(res => {
          this.banners = res.data.banner.list;
          this.recommends = res.data.recommend.list;
        })
      },
      //2请求商品数据
      getHomeGoods(type) {
        const page = this.goods[type].page + 1
        getHomeGoods(type,page).then(res => {

          this.goods[type].list.push(...res.data.list)
          this.goods[type].page += 1
          //完成上拉加载更多
          this.$refs.scroll.finishPullUp()
        })
      }
    }
  }
</script>

<style scoped>
  #home {
    /*padding-top: 44px;*/
    /*vh viewport height 视口*/
    height: 100vh;
    position: relative;
  }

  .home-nav {
    background-color: var(--color-tint);
    color: #fff;


    /*在使用浏览器原生滚动时, 为了让导航不跟随一起滚动*/
    /*position: fixed;*/
    /*left: 0;*/
    /*right: 0;*/
    /*top: 0;*/
    /*z-index: 9;*/
  }

  /*.tab-control {*/
  /*  position: sticky;*/
  /*  top: 44px;*/
  /*  z-index: 9;*/
  /*}*/

  .content {
    /*height: 300px;*/
    overflow: hidden;

    position:absolute;
    top: 44px;
    bottom: 49px;
    left: 0;
    right: 0;
  }
  .tab-control {
    position: relative;
    z-index: 9;
  }

  /*.content {*/
  /*  height: calc(100% - 93px);*/
  /*  overflow: hidden;*/
  /*  margin-top: 44px;*/
  /*}*/
</style>
